Enterprise Vault accounts

The description for each a/c can be found in TN
Enterprise Vault Accounts and Permissions http://www.symantec.com/docs/TECH76700

It is always recommended to keep different user a/c for each above job EV anonymous OWA, EVOM, Reporting and service a/c.

Ev service a/c = open services console on EV server, select any EV service, go to properties, select 'log on as..' tab.

EV owa anonymous a/c = open IIS, expand default web site, select 'EVAnon' VD, select 'Authentication', double click on anonymous authentication,
OR open Vault admin console, right click on 'directory on server....', properties, 'Data access a/c'.

EVOM user a/c= This can be found in EV dir database, monitoringSetting table.

EV reporting user= it can be found by access reporting URL http://SQLserver/reports, select Enterprise vault (i need to check exact details for reporting user).

I hope this help.